Rankine to Celsius Converter
Convert Rankine to °C: (°R − 491.67) × 5/9. 491.67°R = 0°C. Free engineering temperature calculator.
How to Convert Rankine to Celsius
Subtract 491.67 from Rankine, then multiply by 5/9.
Conversion Formula:
(value - 491.67) * 5/9Conversion Examples
Example: 491.67°R to °C
- (491.67 − 491.67) × 5/9 = 0°C
0°C
Freezing point.
Example: 671.67°R to °C
- (671.67 − 491.67) × 5/9 = 100°C
100°C
Boiling point.
Conversion Chart
| Rankine | Celsius |
|---|---|
| 400 | -51.48 |
| 419.67 | -40 |
| 460 | -17.59 |
| 491.67 | 0 |
| 520 | 15.37 |
| 536.67 | 25 |
| 560 | 37.04 |
| 600 | 60.93 |
| 671.67 | 100 |
| 720 | 126.48 |
Conversion Formula
(°R − 491.67) × 5/9 = °C
Quick Conversion Tip
Subtract 491.67, multiply by 5/9.
Unit Definitions
Rankine (°R)
Absolute temperature scale using Fahrenheit-sized degrees.
Subtract 459.67 to reach Fahrenheit, or multiply by 5/9 to reach Kelvin. To get Celsius, subtract 491.67 then multiply by 5/9.
Celsius (°C)
Metric temperature scale with 0°C at freezing and 100°C at boiling.
From Rankine, use (°R − 491.67) × 5/9. From Kelvin, subtract 273.15. From Fahrenheit, subtract 32 then multiply by 5/9.
Common Use Cases
- Engineering problem sets.
- Heat engine analysis.
- Converting lab data to °C.
- Cross-checking thermodynamic tables.
Understanding the Conversion
°C = (°R − 491.67) × 5/9. Inverse of Celsius → Rankine.
491.67°R = 0°C · 671.67°R = 100°C.
Brings US engineering °R readings back to everyday Celsius.
Engineering problem sets. The table and FAQ on this page walk through the factor if you need it.
FAQs
What is the Rankine to Celsius formula?
°C = (°R − 491.67) × 5/9.
Why 491.67?
That is (0°C + 273.15) × 9/5—the Rankine value at water’s freezing point.
Absolute zero in Rankine?
0°R = −273.15°C.